Arsenoarylglycin.



. UNITED STATES PATENT ornrcn.

PAUL EHRLICH AND ALFRED BEltTHEIM, OF FRANKFORT- ON-THE-MAIN GERMANY, ASSIGN- ORS TO FARBWERKE VORM. MEISTER. LUOIUS & BRUNING, OF HOCH ST-ON-THE-MAI N,

GERMANY, A CORPORATION OF GERMANY.

ABSENOARYLGLYCIN.

Application filed November 18,

OOOHOH,NH(4)Aryl(1)As=- As(1)Aryl(4)NHCH,COOH,

which may be obtained by reducing paraarylglycinarsenic acids. This reduction may, for example, be interpreted by the following equation:

These compounds are valuable as medicaments, being employed like atoxyl, which they surpass in their therapeutic action. They are red-brown powders insoluble in water, alcohol and ether, readily dissolved by dilute alkalies and alkali-carbonates. The alkali salts thus formed are of yellow coloration and from their solution the arsenoarylglycine are recipitated as yellow flakes on a dition of ute acids.

The new compounds may instance, as follows: Exam le: A solution of 2 kilos of sodium hydrosu fite in 10 liters of water is added to 1 kilo of crystallized ma nesium chlorid and 600 0.0. of caustic sodaye of 10 times the strength of normal caustic soda-lye and the subse uently filtered solution is added to a hot so ution of 200 grams of para-phen lycinarsenic acid, WhlCll may be obtained oiling para-aminophenylarsenic acid wit chloro-acetic acid in aqueous solution, in 4 liters of water. The mixture is heated for be obtained, for

about 1 hour to 0., whereupon yellow- They are filtered and brown flakes separate.

To remove slightiinrwashed with water.

Specification of Letters Patent.

1907. Serial No. 401,948. (Specimens) ermany, have m- Patented May 19, 1908.

purities of the compoundfthusobtained, it may be dissolved in an excess of sodium carbonate to which is added in the heat lead acetate and after filtration the arsenophenylgflllycin may be precipitated with acetlc acid.

ashed and dried, the arsenophenylgl cin represents a red-brown powder, insolub e in water, alcohol and ether. It is readily soluble in a solution of caustic soda and sodium carbonate with a yellow color and the sodium salt thus formed is precipitated by alcohol from the concentrated aqueous solution in form of a light yellow powder containing water of crystallization.

In an anal ous manner the arsenotolyland arseno-Xy ylglycins, which are very similar to the arsenophen lglycin, may be manufactured from the omologous arylglycin para-arsenic acids. Those homologous acylglycin arsenic acids may be obtained in the same manner as phenylglycin arsenic acid, that is to say, by heating orthoor metatoluidin or para-xylidin with arsenic acid and then combining the thus obtained para-aminoarylarsenic acids with chloracetic acid.

Having now described our invention, what we claim is:

1. As products, the arsenoarylglycins of which the constitution corresponds to the formula:

COOHOH,NH(4)Aryl(1)As= As(1)Aryl(4)NHCH,OOOI-I being red-brown powders, insoluble in water, alcohol and ether, soluble with formation of salts in caustic soda-lye and sodium carbonate with a yellow color, the isolated sodium salts being yellow powders, from the solution of which the arsenoaryl 'lycins are preci itated as yellow-brown fla assuming, when filtered and dried, a darker tint.

. 2. As product, the arsenophenylglycin, corresponding to the formula:

esby dilute aci s,

2 e'sassr beingared-brown powder, insoluble inwater, as our invention, we have signed our namesalcohol and ether, readily soluble in a sodium 1n presence of two subscribing Witnesses. 10 carbonate solution with a yellow color, from AUL ,EHRLICH which solution is precipitated dilute 5 acids as yellow flakes; theyellow sodium salt of the compound being'diflioultly soluble Witnesses: in alcohol. JEAN GRUND, In testimony, that we claim the foregoing CARL GRUmJ; 

